C. Delaere
A5046107413- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Scientific Computing and Data Management
- Radiation Therapy and Dosimetry
- Maritime and Coastal Archaeology
- Nuclear physics research studies
- Optical properties and cooling technologies in crystalline materials
- International Science and Diplomacy
- Nuclear Physics and Applications
UCLouvain
2016-2025
Institute of High Energy Physics
2015-2024
A. Alikhanyan National Laboratory
2014-2024
University of Antwerp
2024
Ghent University Hospital
2013-2023
Centro Brasileiro de Pesquisas Físicas
2023
University of Belgrade
2016
Vinča Institute of Nuclear Sciences
2009-2016
European Organization for Nuclear Research
2007-2014
Austrian Academy of Sciences
2012-2013
The version 3.0 of the Delphes fast-simulation is presented. goal to allow simulation a multipurpose detector for phenomenological studies. includes track propagation system embedded in magnetic field, electromagnetic and hadron calorimeters, muon identification system. Physics objects that can be used data analysis are then reconstructed from simulated response. These include tracks calorimeter deposits high level such as isolated electrons, jets, taus, missing energy. new modular approach...
CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV Large Hadron Collider (LHC). It currently involves more than 2000 physicists from 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle based on its unprecedented collision energy luminosity when it begins operation in 2007.
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range pseudorapidity (eta) azimuthal angle (phi). Short-range Delta(eta), which studied minimum bias events, characterized simple "independent cluster" parametrization order to quantify their strength (cluster size) extent eta decay width). Long-range differentially as...
Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the CMS detector LHC, using data sample corresponding to an integrated luminosity 6.7 inverse microbarns. Jets are reconstructed deposited calorimeters and as function collision centrality. With increasing centrality, striking imbalance dijet transverse momentum is observed, consistent jet quenching. The observed effect extends from lower cut-off used this study (jet = 120 GeV/c) up...
Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon–nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collected with the CMS detector LHC. studied over broad range pseudorapidity, η, and full azimuth, ϕ, as function particle multiplicity transverse momentum, pT. In high-multiplicity events, long-range (2<|Δη|<4), near-side (Δϕ≈0) structure emerges Δη–Δϕ correlation functions. This is first observation...
Measurements of the jet energy calibration and transverse momentum resolution in CMS are presented, performed with a data sample collected proton-proton collisions at centre-of-mass 7TeV, corresponding to an integrated luminosity 36pb−1. The balance dijet γ/Z+jets events is used measure response detector, as well resolution. results presented for three different methods reconstruct jets: calorimeter-based approach, ``Jet-Plus-Track'' which improves measurement calorimeter jets by exploiting...
A detailed description is reported of the analysis used by CMS Collaboration in search for standard model Higgs boson pp collisions at LHC, which led to observation a new boson. The data sample corresponds integrated luminosities up 5.1 inverse femtobarns sqrt(s) = 7 TeV, and 5.3 8 TeV. results five decay modes gamma gamma, ZZ, WW, tau tau, bb, show combined local significance 5 deviations near 125 GeV, are reviewed. fit invariant mass two high resolution channels, ZZ 4 ell, gives estimate...
At the Large Hadron Collider, identification of jets originating from b quarks is important for searches new physics and measurements standard model processes. A variety algorithms has been developed by CMS to select b-quark based on variables such as impact parameters charged-particle tracks, properties reconstructed decay vertices, presence or absence a lepton, combinations thereof. The performance these measured using data proton-proton collisions at LHC compared with expectations...
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ are measured with the inner tracking system of CMS detector LHC. The charged-hadron yield is obtained by counting number reconstructed hits, hit pairs, fully charged-particle tracks. combination three methods gives a multiplicity per unit...
A study is presented of the mass and spin-parity new boson recently observed at LHC a near 125 GeV. An integrated luminosity 17.3 fb(-1), collected by CMS experiment in proton-proton collisions center-of-mass energies 7 8 TeV, used. The measured ZZ channel, where both Z bosons decay to e or μ pairs, 126.2 ± 0.6(stat) 0.2(syst) angular distributions lepton pairs this channel are sensitive boson. Under assumption spin 0, present data consistent with pure scalar hypothesis, while disfavoring...
New sets of CMS underlying-event parameters ("tunes") are presented for the PYTHIA8 event generator. These tunes use NNPDF3.1 parton distribution functions (PDFs) at leading (LO), next-to-leading (NLO), or next-to-next-to-leading (NNLO) orders in perturbative quantum chromodynamics, and strong coupling evolution LO NLO. Measurements charged-particle multiplicity transverse momentum densities various hadron collision energies fit simultaneously to determine tunes. Comparisons predictions new...
The observation of the standard model (SM) Higgs boson decay to a pair bottom quarks is presented. main contribution this result from processes in which bosons are produced association with W or Z (VH), and searched for final states including 0, 1, 2 charged leptons two identified quark jets. results measurement these data sample recorded by CMS experiment 2017, comprising 41.3 fb$^{-1}$ proton-proton collisions at $\sqrt{s} =$ 13 TeV, described. When combined previous VH measurements using...
In July 2012, the ATLAS and CMS collaborations at CERN Large Hadron Collider announced observation of a Higgs boson mass around 125 gigaelectronvolts. Ten years later, with data corresponding to production 30-times larger number bosons, we have learnt much more about properties boson. The experiment has observed in numerous fermionic bosonic decay channels, established its spin-parity quantum numbers, determined measured cross-sections various modes. Here Collaboration reports most...
Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at $\sqrt{s} = 0.9 $ 2.36 TeV. The data were collected with the CMS detector during LHC commissioning in December 2009. For non-single-diffractive interactions, average transverse momentum is measured to be 0.46 ± 0.01 (stat.) (syst.) GeV/c TeV 0.50 TeV, pseudorapidities between --2.4 +2.4. At these energies, densities central region, dN ch/dη||η|<0.5, 3:48...
A measurement of inclusive W and Z production cross sections in pp collisions at $ \sqrt {s} = 7 TeV is presented. The electron muon decay channels are analyzed a data sample collected with the CMS detector LHC corresponding to an integrated luminosity 36 pb−1. measured σ(pp → WX) × \mathcal{B}\left( {{\text{W}} \to \ell \nu } \right) 10.31 ± 0.02 (stat.) 0.09 (syst.) 0.10 (th.) 0.41 (lumi.) nb ZX) {{\text{Z}} {\ell^{+} }{\ell^{-} }} 0.974 0.007 0.018 0.039 nb, limited dilepton invariant...
The suppression of the individual Upsilon(nS) states in PbPb collisions with respect to their yields pp data has been measured. and sets used analysis correspond integrated luminosities 150 inverse microbarns 230 nanobarns, respectively, collected 2011 by CMS experiment at LHC, a center-of-mass energy per nucleon pair 2.76 TeV. are measured from dimuon invariant mass spectra. relative scaled number nucleon-nucleon collisions, R[AA], is as function collision centrality. Integrated over...
Measurements of inclusive W and Z boson production cross sections in pp collisions at $ \sqrt {s} = 7 TeV are presented, based on 2.9 pb−1 data recorded by the CMS detector LHC. The measurements, performed electron muon decay channels, combined to give \sigma \left( {{\text{pp}} \to {\text{W}}X} \right) \times \mathcal{B}\left( {{\text{W}} \ell \nu } 9.95\pm 0.07\left( {{\text{stat}}{.}} \right)\pm 0.28\left( {{\text{syst}}{.}} 1.09 (lumi.) nb {\text{Z}}X} {Z {\ell^{+} }{\ell^{-} }} 0.931\pm...
A search for events with jets and missing transverse energy is performed in a data sample of $pp$ collisions collected at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ by the CMS experiment LHC. The analyzed corresponds to an integrated luminosity $1.14\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. In this search, kinematic variable ${\ensuremath{\alpha}}_{\mathrm{T}}$ used as main discriminator between genuine misreconstructed energy. No excess over standard model expectation found. Exclusion limits...
A bstract Yields of prompt and non-prompt J/ ψ , as well $ \Upsilon (1S) mesons, are measured by the CMS experiment via their μ + − decays in PbPb pp collisions at \sqrt {{{s_{\text{NN}}}}} = 2.76 TeV for quarkonium rapidity | y < 2.4. Differential cross sections nuclear modification factors reported functions transverse momentum p T collision centrality. For with relatively high (6.5 30 GeV/ c ), a strong, centrality-dependent suppression is observed collisions, compared to yield scaled...
The anisotropy of the azimuthal distributions charged particles produced in $\sqrt{{s}_{NN}}=2.76$ TeV PbPb collisions is studied with CMS experiment at LHC. elliptic parameter, ${v}_{2}$, defined as second coefficient a Fourier expansion particle invariant yields, extracted using event-plane method, two- and four-particle cumulants, Lee-Yang zeros. presented function transverse momentum (${p}_{\mathrm{T}}$), pseudorapidity ($\ensuremath{\eta}$) over broad kinematic range,...
Dijet production in PbPb collisions at a nucleon–nucleon center-of-mass energy of 2.76 TeV is studied with the CMS detector LHC. A data sample corresponding to an integrated luminosity 150 μb−1 analyzed. Jets are reconstructed using combined information from tracking and calorimetry, anti-kT algorithm R=0.3. The dijet momentum balance angular correlations as function collision centrality leading jet transverse momentum. For most peripheral collisions, good agreement distributions pp...
The measurement of the luminosity recorded by CMS detector installed at LHC interaction point 5, using proton-proton collisions s=13TeV in 2015 and 2016, is reported. absolute scale measured for individual bunch crossings beam-separation scans (the van der Meer method), with a relative precision 1.3 1.0% respectively. dominant sources uncertainty are related to residual differences between beam positions ones provided operational settings magnets, factorizability proton spatial density...
At the start of Run 2 in 2015, LHC delivered proton-proton collisions at a center-of-mass energy 13 TeV. During (years 2015-2018) eventually reached luminosity 2.1 $\times$ 10$^{34}$ cm$^{-2}$ s$^{-1}$, almost three times that during 1 (2009-2013) and factor two larger than design value, leading to events with up mean about 50 simultaneous inelastic per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior 2016 improve selection physics challenging conditions posed by second...
The performance of missing transverse momentum (Tmiss) reconstruction algorithms for the CMS experiment is presented, using proton-proton collisions at a center-of-mass energy 13 TeV, collected CERN LHC in 2016. data sample corresponds to an integrated luminosity 35.9 fb-1. results include measurements scale and resolution Tmiss, detailed studies events identified with anomalous Tmiss. presented Tmiss algorithm that mitigates effects multiple interactions, "pileup per particle...
Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data PbPb at a centre-of-mass energy 2.76TeV per nucleon pair corresponding to an integrated luminosity 150μb−1 recorded by CMS experiment LHC. For events containing isolated photon with transverse momentum pTγ>60GeV/c and associated pTJet>30GeV/c, pT imbalance is studied as function collision centrality compared pp pythia calculations same energy. Using pTγ...